[Boost-users] Boost MPI Collective

In boost/mpi/collectives/reduce.hpp The template function specialization for reduce-ing a std::vector, should probably be modified. Ffrom template void reduce(const communicator & comm, std::vector<T> const & in_values, std::vector<T> & out_values, Op op, int root) { out_values.resize(in_values.size()); reduce(comm, &in_values.front(), in_values.size(), &out_values.front(), op, root); } To template void reduce(const communicator & comm, std::vector<T> const & in_values, std::vector<T> & out_values, Op op, int root) { if( comm.rank() == root ) out_values.resize(in_values.size()); reduce(comm, &in_values.front(), in_values.size(), &out_values.front(), op, root); } This will save an extraneous allocation on the non-root nodes. -steve